JP2777887B2 - Small pump - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small-sized pump which is effective for use in a simple blood pressure type or the like and has little noise. [Prior Art] In recent years, personal type sphygmomanometers have become widespread, and a small-sized and efficient pump is used as a pump for this purpose. [Problems to be Solved by the Invention] However, in order to reduce the size of the conventional small pump, the intake port opened and closed by the valve element of the pump chamber is exposed to the outside. For this reason, there has been a problem that a sound accompanying the passage of air is generated every time air is periodically sucked from the intake hole by the pump action, and this causes noise. [Means for Solving the Problems] The present invention provides a lid that forms a space with the substrate above the substrate provided with the valve element and the pump chamber below the intake port, and the lid has a space. And a suction hole communicating with the portion. Further, a sound deadening cover is further provided on the lid to form a space, and a curved passage connecting the suction port of the sound deadening lid and the suction hole of the lid is formed in the space. [Operation] A space is formed between the suction hole into which air enters from the outside or the suction port and the suction hole of the substrate, and the suction flow is damped, so that the sound is reduced. [Examples] Hereinafter, the present invention will be described in detail with reference to examples shown in the drawings. FIG. 1 is a sectional front view of an embodiment of a small pump according to the present invention, and FIG. 2 is a plan view of a substrate thereof. Fig. 1 is the second
It is the figure cut | disconnected by the AA of the figure. In these figures, 1 is a small DC motor, 2 is an output shaft of the motor 1, 3 is a cup having substantially the same diameter as the motor 1, and the bottom surface is attached to a surface on the output shaft side of the motor 1 by a screw 4. Case 5 is a color fixed to output shaft 2,
Reference numeral 6 denotes a drive shaft which is inclined at a predetermined angle with respect to the output shaft 2 and which is fixed to the collar 5 so that its tip is located on the center axis of the output shaft 2, and 7 is formed in a disk shape and is formed at intervals of 120 degrees. A driving body having three holes 8 provided, 9 is a cylindrical supporting portion extending downward at the center of the driving body 7 and integrally formed, and 10 is a friction member between the driving shaft 6 and the driving body 7. It is a steel ball to make it smaller. The support portion 9 is loosely fitted into the drive shaft 6, and when the output shaft 2 rotates, the drive shaft 6 rotates in an inclined state. Then, perform a so-called pan-turning exercise. Numeral 11 is formed in a cup shape, and three cylindrical holes 12 are formed at 120 ° intervals on the bottom surface (the upper surface in FIG. 1), and the opening sides thereof are screwed into the opening sides of the case 3. In this case, three screw holes 13 are formed at intermediate positions of the holes 12 as shown in a plan view in FIG. Reference numeral 14 denotes a diaphragm main body formed on a disk made of an elastic material such as soft and thin rubber, and its plane is shown in FIG. 4 and its bottom surface is shown in FIG. Reference numeral 15 denotes three hanging bell-shaped diaphragm parts which extend downward from the surface of the main body at intervals of 120 degrees and are integrally formed, 16 is a driving part at the center thereof, 17 is a thin neck at the tip of the driving part 16. The formed head 18 is a cylindrical valve body that extends upward from the center of the surface of the main body on the side opposite to the diaphragm 15 and is integrally formed and becomes thinner as it becomes earlier. The head 17 penetrates the hole 8 of the driving body 7 and protrudes to the lower surface side of the driving body 7, whereby the driving unit 16 is held by the driving body 7. Three holes 19 through which screws pass are formed at intermediate positions between the respective diaphragm portions 15 of the diaphragm main body 14. 20 is a circular recess 21 formed on the bottom surface at intervals of 120 degrees.
FIG. 6 shows a bottom surface of the substrate. An outer peripheral portion 20a of a cylindrical projection is formed at a peripheral portion of the substrate 20. Two
Reference numeral 2 denotes a hole formed in the center of the concave portion 21; 23, intake holes formed in each of six holes around the hole 22; 24, a valve chamber formed upward in the center of the substrate 20; This is an exhaust hole formed by making the tip of the chamber 24 thin. Reference numerals 26 shown in FIGS. 2 and 6 denote three holes formed at intermediate positions of the holes 22 so as to allow screws to pass therethrough. 27 is formed around the hole 26
This is a cylindrical portion having the same height as 20a. As shown in the plan view of FIG. 7, reference numeral 35 denotes a disk-shaped lid having a hole 36 at the center thereof through which the valve chamber portion 24 penetrates and having three holes 37 through which screws are passed. . Reference numeral 38 denotes an absorption hole formed near the outer periphery of the lid 35. Numeral 40 is a screw which passes through the holes 37, 27 and 19 and is screwed into the screw hole 13. By this screwing, the substrate 20 is sandwiched between the diaphragm body 14 and the case 11.
, And three pump chambers 28 are formed by the concave portion 21 of the substrate 20 and the diaphragm portion 15. Substrate 20 is valve chamber 24
A common chamber 29 is formed therein, and each recess 21 has a notched groove 30 formed inward (in the direction of the center of the substrate), and is connected to the common chamber 29. Therefore, each pump chamber 28 is a common chamber.
29 will be in common communication in the center. In addition,
The valve body 18 is in contact with the inner peripheral surface of the valve chamber 24 and closes the communication passage. 31 is a spherical valve body made of an elastic material such as soft rubber and formed so as to be thinner toward the periphery, 32 is a support pillar extending upward at the center of the valve body 31 and integrally formed, and 33 is a support pillar 32. A thicker head formed at the tip. These have an umbrella shape and a mushroom shape as a whole. The valve element 31 is an intake hole
The support pillar 32 penetrates the hole 22, and the head 33 is attached to the board 20 so that the head 33 does not come out to the outside and pass through the hole 22. The cover 35 is fixed to the substrate 20 by screwing the screws 40, and a space 41 is formed by the cover 35, the substrate 20, the outer peripheral portion 20 a, and the valve chamber 24. Next, the operation of the small pump configured as described above will be described. When the motor 1 is energized and the output shaft 2 rotates, the drive shaft 6 also rotates, whereby the driver 7 makes a panning motion, and the drive unit 16 of each diaphragm unit 15 vibrates up and down with a phase difference of 120 degrees. . Due to the piston movement of the diaphragm portion 15, the volume of the pump chamber 28 changes periodically. When the drive unit 16 moves downward to increase the volume, the pump chamber
28 is depressurized and the valve body 18 closes in close contact with the valve chamber 24, and on the contrary, the valve 31 opens and passes through the suction hole 38, the space 41 and the suction hole 23.
Air flows in from. Since both the valve body portion 18 and the valve body 31 are thinner at the tip, they can be sufficiently closed and opened. Next, when the drive unit 16 moves upward to reduce the volume, the pressure in the pump chamber 28 is increased, and the valve body 31 closes and closes to the substrate 20. Conversely, the valve body 18 closes the pump chamber 28. The portion closing the groove 30 is opened, and the air in the pump chamber 28 passes through the common chamber 29 and is discharged from the exhaust hole 25. Also in this case, closing and opening are sufficiently performed as described above. Each of the pump chambers performs a pumping operation once with one rotation of the driving body. However, the pumping operation is performed three times as a whole, and the pulsation of the air flow is reduced, thereby improving the operation efficiency. In addition, a pump chamber is formed integrally with the motor, and a plurality of pump chambers are arranged around a common chamber at the center, and a driving body is arranged between the motor and the pump chamber. The shape becomes very small because the device and the motor are integrated. In addition, since the pumping action is performed by using the panning motion of the driving body, it is possible to cause the diaphragm to perform the piston motion even in a narrow space, and the pumping action is performed smoothly and efficiently. Further, at the time of suction of the pump action, the air once enters the space portion 41 from the suction hole 38 and further enters the pump chamber 28 through the suction hole 23, so that the generation of the suction noise is reduced and the generated sound is also reduced. The level is lowered by being blocked by the lid 35. Next, another embodiment of the present invention will be described. FIG. 8 is a sectional front view of this embodiment, showing the same position as FIG. In addition, a diaphragm, a case, and the like are omitted. In the figure, reference numeral 43 denotes a sound deadening lid, as shown in FIG. 9, a bottom view having a hole 44 having a diameter larger than the outer diameter of the valve chamber portion 24 at the center, and a cylindrical outer peripheral portion 45 on the outer periphery. Is formed. Reference numeral 46 denotes three holes for passing screws, and 47 denotes a cylindrical portion formed around the hole 46 and having the same height as the outer peripheral portion 45. Reference numeral 48 denotes a spiral wall having the same height as the outer peripheral portion 45 which is formed in a spiral shape from the periphery of the hole 44 toward the outer peripheral portion 45, and 49 denotes a passage formed by the spiral wall 48. FIG. 8 shows a position cut along the line BB in FIG. Sound deadening lid
43 is provided concentrically on the lid 35 and has a screw
By screwing 40 into the screw hole 13 through the holes 46, 37, 26, and 19, it is fixed around the valve chamber 24. Muffler lid 43
A ring-shaped suction port 50 is formed between the hole 44 and the outer periphery of the valve chamber section 24. At the time of pumping air, air flows from the suction port
Then, it passes through the spiral-shaped passage 49 to the outer peripheral portion, passes through the suction hole 38 of the lid 35, enters the space 41, and further passes through the suction hole 23 into the pump chamber 28. The sound generated in the intake hole 23 is reduced by the cover 35 and the sound deadening cover 43. It is preferable that the diameter of the suction hole 38 of the lid 3 be larger than that of the embodiment shown in FIG. As a result, the air resistance is reduced and the sound does not come out because the sound deadening cover 43 is provided. FIG. 10 shows a bottom view of a sound deadening lid according to another embodiment. Sound deadening lid
The 43a is formed with three holes 46a for passing screws and a hole 44a for inserting the valve chamber 24. Valve chamber 24 and hole 44a
The gap between them is narrow, and no air enters from here. 49
a is a passage formed by a groove formed in a circular shape on a disc-shaped silencing lid 43a, one end of which is aligned with the suction hole 38 of the lid 35 when assembled, and the other end is silenced. It is connected to a suction port 50a formed through the lid 43a. In this embodiment, the bottom is flat except for the groove, so that the airtightness of the passage 49a can be maintained even if the lid 35 is formed of thin rubber. FIG. 11 shows a bottom view of a sound deadening lid according to another embodiment. Sound deadening lid
43b has a hole 44b, three holes 46b, a suction port 50b, and a passage 4b.
A plurality of small chambers 51 are formed in 9b. The muffler effect is generated by the small chamber 51, and the sound is further reduced. [Effects of the Invention] As described above, according to the small-sized pump according to the present invention, by providing the lid or the sound deadening lid, it is possible to significantly reduce noise generated as intake sound by the pump action, A small, quiet, high-performance pump can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional front view of one embodiment of a small pump according to the present invention, FIG. 2 is a plan view of a substrate thereof, FIG. 3 is a plan view of a case, and FIG. FIG. 5 is a bottom view of the main body, FIG. 6 is a bottom view of the substrate 20, FIG. 7 is a plan view of the lid, FIG. FIG. 9 is a bottom view of the sound deadening lid, and FIGS. 10 and 11 are bottom views of the sound deadening lids of other embodiments. 1 small DC motor, 3,11 case, 7 driving body, 14 diaphragm body, 15 diaphragm part,
16 ... Drive part, 18 ... Valve part, 20 ... Substrate, 23 ... Intake hole, 24 ... Valve chamber part, 25 ... Exhaust hole, 28 ... Pump chamber, 29
…… Common room, 30… Groove, 31… Valve, 35… Lid, 38
…… Suction hole, 41 …… Space part, 43 …… Mute cover, 48 …… Swirl wall, 50 …… Suction port.

Claims (1)

(57) [Claims] A substrate having an exhaust hole in the center and having a plurality of intake holes formed at substantially equal angular intervals so as to surround the exhaust hole, and a disk-shaped substrate as a whole; A diaphragm body that forms a chamber is provided on the output shaft of the motor in order to perform a pump action by sequentially driving each diaphragm part of the diaphragm body at a fixed time interval, and a diaphragm body in which the respective diaphragm parts are integrally connected. A driving unit that is provided concentrically and inclined and performs a panning motion by rotation of the output shaft, a common chamber that communicates with the exhaust hole formed between a pump chamber and an exhaust hole, and an inner wall surface of the common chamber. A first valve body which is disposed so as to be in close contact with and is integrally formed with the diaphragm portion, and a second valve body which is provided in each pump chamber on the lower surface of the substrate so as to open and close an intake hole.
And a lid having a suction hole, and a lid provided above the substrate and forming a space communicating with the suction hole and the suction port together with the substrate. 2. 2. The small pump according to claim 1, wherein the space is a curved passage communicating the suction port with each suction hole.